Sweet Revenge (1984)

While a major in the US Army Joe Cheever has a fling with his commanding officers daughter that results in a pregnancy Cheever convinces the girl to have an illegal abortion The abortion goes wrong and the girl dies To protect his career Cheever implicates Captain Dennison whose life is thereby ruined Years later the Captains now grownup sister Katherine marries Army Major Alex Breen and is stunned to learn his commanding officer is the now Colonel Cheever She becomes obsessed with getting revenge for the sake of her dead brother